The Allen-Bradley 1794-OB16 module is a high-density digital output solution for distributed I/O applications. This unit provides sixteen non-isolated, sourcing outputs that operate at 24 Volts DC nominal. Its design ensures reliable switching for a wide range of field devices. The module has an on-state voltage range from 10 to 31.2V DC and a maximum output current of 500mA per channel. Moreover, its compact form factor makes it suitable for space-constrained control cabinets.
This output module delivers dependable performance for industrial automation tasks. Its electrical characteristics ensure compatibility with standard 24V DC field devices.
Output Characteristics
Number of Outputs: The 1794-OB16 features 16 sourcing outputs arranged in one group. Please note that these channels are non-isolated from each other.
Voltage Range: The on-state voltage range is from 10V DC minimum up to 31.2V DC maximum, with a nominal voltage of 24V DC.
Current Ratings: Each channel supports a minimum on-state current of 1.0mA and a maximum of 500mA. The total output current rating for all 16 channels is 8A at 0.5A per channel.
Signal Delay: This module offers a fast off-to-on signal delay of 0.5ms and an on-to-off delay of 1.0ms maximum. Such fast response times are crucial for precision control.
Surge Current: It can handle a surge current of 2A for 50ms, which is repeatable every 2 seconds. This feature allows the module to drive loads with high inrush currents.
Power and Isolation
FlexBus Current: The maximum FlexBus current drawn by the 1794-OB16 is 80mA at 5V DC.
Power Dissipation: Under maximum load at 31.2V DC, the module dissipates up to 5.3W of power.
Thermal Dissipation: Its thermal dissipation is rated at 18.1 BTU/hr under the same conditions.
Isolation: The module provides 850V DC isolation testing between the user and system. However, there is no isolation between the individual output channels.
Understanding the physical and environmental limits is key to a successful installation. The 1794-OB16 is built to withstand harsh industrial settings.
Physical Dimensions
Dimensions (HxWxD): The module measures 46mm x 94mm x 53mm (1.8in x 3.7in x 2.1in).
Weight: It has a lightweight design, weighing approximately 78 grams (2.75 oz).
Enclosure: The unit has an open-type enclosure and its keyswitch position is set to 2.
Environmental Limits
Operational Temperature: You can operate this unit in environments from 0 to 55°C (32 to 131°F).
Storage Temperature: For storage, the acceptable range is -40 to 85°C (-40 to 185°F).
Shock and Vibration: The module withstands 30g of operating shock and is tested to 5g of vibration at 10-500Hz per IEC 68-2-6.
Humidity: It functions correctly in conditions with 5 to 95% non-condensing relative humidity.
Proper installation ensures the longevity and reliability of the Allen-Bradley 1794-OB16.
Terminal Base Requirements
This module is not a standalone unit; it must be mounted on a compatible terminal base. Specifically, it is designed for use with the 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, and 1794-TB3SK base units. The wiring size you use will depend on the specific terminal base you select.
System Integration
You can install up to eight instances of the 1794-OB16 in a single Flex I/O rack. This allows for significant channel density in one location. Besides, it works with any 1794 Flex I/O adapter for distributed applications. It also serves as local I/O for the FlexLogix controller or the 1794-FLA extender.
Fusing
The module does not include internal fusing. Therefore, you should install external fusing for circuit protection. The recommended fuse for this purpose is the SAN-O MQ4-800mA.
Your shipment for the Allen-Bradley 1794-OB16 will include the following item:
(1) Allen-Bradley 1794-OB16 Flex I/O DC Output Module
1. Is the Allen-Bradley 1794-OB16 compatible with the 1794-TB3S terminal base?
Yes, the 1794-OB16 is fully compatible with the 1794-TB3S terminal base unit, along with the 1794-TB2 and 1794-TB3 models.
2. What is the maximum current I can draw from a single output channel?
Each output channel on the 1794-OB16 can supply a maximum continuous current of 500mA (0.5A). Ensure your load does not exceed this limit.
3. Do I need to install a fuse for the 1794-OB16 module?
The manufacturer recommends using an external fuse for protection because the 1794-OB16 does not have internal fusing. A suitable fuse type is the SAN-O MQ4-800mA.
4. What does the keyswitch position 2 mean for this module?
The keyswitch position is a mechanical feature that prevents inserting the module into the wrong terminal base. The 1794-OB16 requires its keyswitch to be set to position 2.
5. What is the signal delay when turning the outputs from off to on?
The off-to-on signal delay for the 1794-OB16 is 0.5 milliseconds maximum, ensuring fast output response for time-critical processes.
| Brand Name | |
| Model No. | 1794-OB16 |
| Product Type | Discrete Output Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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